Tone-modifier for phonocraphs



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TONE MODIFIER FOR PHONOGRAPHS. APPllcATl'oN FILED ocT. 23. 1920.

1,394,646. Patented oct. 25, 1921.

*valgan-,v1.5 r l I WALTER SCOTT, or SHERIDAN, WYOMING.

TONE-MODIFIER FOR PHON OC-RAPHS.

Specification of Letters Patent. Patented Oct. 25, 1921.

Application filed October 23, 1920. ,Serial No. 418,989.Y

To all whom, it may concern:

Be it known that I, WALTER SCOTT, a citi zen of the United States, residing at Sheridan, in the county of Sheridan and State of lVyoming, have invented certain new and useful improvements in ToneModiiers for Phonographs, of which the following is a specification, reference being had to the accompanying dra-wings.

IThis invention relates to attachments tor phonographs, and particularly to means Jiterl modifying the tone, that is' the sound issuingn from the tone chamber or ampliiier of a phonographi-.c cabinet.

)i further object is to provide a. device or this character consisting of a 1frame supporting a pluraiitv c? closely adjacent coiled springs esten ansverselz,v1 of the 'direction ci the sani i waves to reduce the or scratching tone of the phonoi pli and to reinforce the tone waves.

@ther objects will appear the course of the following description;

' My invention is illustrated in the accompanying drawings, wherein Figure 1 is a vertical sectional view through a portion et a phonograph cabinet showing the tone Chamber or amplifying chamber in section, and showing my device in place therein, the device being shown in elevation 2 is a top plan view .of the tone moditi/ing device forming the subject matter of my invention;

iteterring to these drawings, it 'wili be seen that :my attachment comprises two approximately triangular plates 10 and 11 disposed in spaced relation to each other and connected by means of three transversel)r extending rods i2 disposed at the Corners .of the triangular plates. rthese plates are preferably formed with periiorations 13. The plates are notI disposed in parallel relation to each other but in a slightly convergent relation, as illustrated in the plan view in Fig. 2 and each of these plates on two oi' its edge faces is formed with equi-distantly spaced prongs 14. Stretched between these prongs are a series of small contractile coiled springs 15. These springs may be all of the same diameter and the same number of coils, or they may be of different diameters and oi a different number oi coils. Preferably 'the springs on one side of thetoning device will be relatively large and the springs on the opposite side relatively small. Thusthe f springs on one side may have a diameter' of approximately while the springs on the opposite side may have a diameter of twice or three times that, the larger springs having their convolutions relatively greatlv separated. I do not Wish to be limited to having the springs of a single size on each face of the device, but may use, as before stated, the series of springs of different sizes and different tensions and each capable of responding to and vibrating under a diierent tone.

in the use of this device, it is disposed within the tone chamber B ci' a phonographic cabinet A, as illustrated, with the relatively large springs disposed toward the outer 'end or the tone chamber B and the relatively small springs disposed toward the tone arm. This device is simply placed in the tone chamber, as illustrated, and approx imately fills the space between the side walls oi the tone chamber. The sound waves issuing from the tone arm into the tone ychamber and passing through the tone chamber will strike these springs and set them into vibration, which will, l iind, modify the vibrations and cause the various tones to be reinforced by the vibrations or the springs. At the same time l iind that this device tends to modiy and eliminate the grinding or grating noise which is such an unpleasant accompaniment ot Aphonograplnlc reproduction.

lt will be obvious that the springs may be arranged 'so that certain springs will vibrate to one tone and certain other springs will vibrate to other tones so that there will be a sympathetic vibration of one or more of the springs which will rein-force the tones given od by the phonograph.

l do not wish to be limited to the exact construction illustrated, as this might be modified in many ways Without departing from the spirit of the invention, but I have found this attachment particularly useful and effective as illustrated.

. I claim 1. The combination with a phonograph having an amplifier constituting a torn` chamber, of a supporting trame disposed within the amplifier, and stretched coiled springs attached to the frame and supported thereby. these springs being of dierent diameters and having a different number of convolutions to the inch, the springs extending transversely of the path of movement of the sound waves through the amplier. i

2. A tone modifier for phonographs comprising oppositely disposed, spaced, triangular plates, and a series of coiled contractile springs stretched across the space between said plates and engaged with the edges of the plates on two sides of the triangle.

3. A tone modiier for phonographs comprising two triangular plates held in spaced relation to each other, the faces of said plates being adapted to rest upon the ioor of a tone chamber, the other margins of the triangular platesy having prongs projecting therefrom and stretched coiled contractile springs extending across the space between the plates and engaged at their ends with said prongs.

tending across the space between the plates p and engaged at their ends with said prongs, the Springs on one side of the triangular frame formed by said plates being of .diferent diameter and having a different number of convolutions to the inch from the springs on the opposite side of said triangular frame.

ln testimony whereol l hereunto atto; my

signature. 

